fix nodenumber plugin to use Pod name instead of pod.spec.nodeName

[YZ775]

What type of PR is this?

/kind bug

What this PR does / why we need it:

The nodeNumber plugin is intended to scores higher if the node name and pod name suffixes match.
But in implementation, it uses Pod's .Spec.nodeName not a .metadata.Name.
So PreScore allways return nothing, and therefore allways match=true in Score.

This PR fix this problem

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

change nodeNumber plugin to follow specification.

What are the benchmark results of this change?

after.txt
before.txt

❯ benchstat before.txt after.txt
goos: darwin
goarch: arm64
pkg: sigs.k8s.io/kube-scheduler-wasm-extension/internal/e2e/scheduler
cpu: Apple M1
                                      │  before.txt  │              after.txt              │
                                      │    sec/op    │    sec/op     vs base               │
Example_NodeNumber/Simple/New-8         497.5m ± 14%   506.5m ±  1%        ~ (p=0.394 n=6)
Example_NodeNumber/Simple/Run-8         177.8µ ± 30%   169.1µ ± 10%        ~ (p=0.310 n=6)
Example_NodeNumber/Simple_Log/New-8     531.7m ± 19%   501.5m ±  4%        ~ (p=0.310 n=6)
Example_NodeNumber/Simple_Log/Run-8     206.7µ ± 17%   213.9µ ± 19%        ~ (p=0.310 n=6)
Example_NodeNumber/Advanced/New-8        1.081 ± 12%    1.076 ±  5%        ~ (p=1.000 n=6)
Example_NodeNumber/Advanced/Run-8       62.07µ ±  4%   69.25µ ±  3%  +11.56% (p=0.002 n=6)
Example_NodeNumber/Advanced_Log/New-8    1.084 ± 80%    1.066 ±  4%        ~ (p=0.937 n=6)
Example_NodeNumber/Advanced_Log/Run-8   76.83µ ± 17%   79.26µ ±  2%        ~ (p=0.394 n=6)
geomean                                 9.265m         9.338m         +0.78%

[sanposhiho]

/lgtm
/approve

[k8s-ci-robot]

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This pull-request has been approved by: sanposhiho, YZ775

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